Java JProgressBar未更新
我在这里编写了一个非常简单的代码来显示它,我有一个按钮,应该显示一个JDialog来检查进度状态,我正在使用invoke late来通过EDT,我的循环不在run方法中,那么为什么我的条不更新呢? 这是密码Java JProgressBar未更新,java,swing,event-dispatch-thread,jprogressbar,Java,Swing,Event Dispatch Thread,Jprogressbar,我在这里编写了一个非常简单的代码来显示它,我有一个按钮,应该显示一个JDialog来检查进度状态,我正在使用invoke late来通过EDT,我的循环不在run方法中,那么为什么我的条不更新呢? 这是密码 import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import ja
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class JBarEx extends JFrame {
private JTextField progStatus = new JTextField("Undefined");
private JButton dialogBtn = new JButton("Show Progression dialog");
final JDialog dlg = new JDialog((JFrame) null, "prog Title", false);
final JProgressBar dpb = new JProgressBar(0, 100);
public JBarEx() {
JPanel pan = new JPanel();
dialogBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
showProgress();
}
});
progStatus.setEditable(false);
pan.add(progStatus);
pan.add(dialogBtn);
setContentPane(pan);
this.setSize(200, 100);
setVisible(true);
}
public void showProgress() {
dlg.add(BorderLayout.CENTER, dpb);
dlg.add(BorderLayout.NORTH, new JLabel("prog message"));
dlg.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
dlg.setSize(300, 75);
dlg.setLocationRelativeTo(null);
dlg.setVisible(true);
for (int i = 0; i < 100; i++) {
final int ii = i;
try {
Thread.sleep(25);
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
updateBar(ii);
}
});
}
catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public void updateBar(int newValue) {
dpb.setValue(newValue);
}
public static void main(String[] args) {
JBarEx jbx = new JBarEx();
}
import javax.swing.JButton;
导入javax.swing.JDialog;
导入javax.swing.JFrame;
导入javax.swing.JLabel;
导入javax.swing.JPanel;
导入javax.swing.JProgressBar;
导入javax.swing.JTextField;
导入javax.swing.SwingUtilities;
导入java.awt.BorderLayout;
导入java.awt.event.ActionEvent;
导入java.awt.event.ActionListener;
公共类JBarEx扩展了JFrame{
私有JTextField progStatus=新JTextField(“未定义”);
私有JButton dialogBtn=新JButton(“显示进度对话框”);
final JDialog dlg=新JDialog((JFrame)null,“prog Title”,false);
最终JProgressBar dpb=新JProgressBar(0,100);
公共JBarEx(){
JPanel pan=新的JPanel();
dialogBtn.addActionListener(新ActionListener(){
@凌驾
已执行的公共无效操作(操作事件e){
//TODO自动生成的方法存根
showProgress();
}
});
progStatus.setEditable(false);
pan.add(progStatus);
pan.add(dialogBtn);
设置内容窗格(pan);
这个。设置大小(200100);
setVisible(真);
}
公共服务进展{
dlg.add(BorderLayout.CENTER,dpb);
dlg.add(BorderLayout.NORTH,新JLabel(“程序消息”);
dlg.setDefaultCloseOperation(JDialog.DISPOSE\u ON\u CLOSE);
dlg.设置尺寸(300,75);
dlg.setLocationRelativeTo(空);
dlg.setVisible(真);
对于(int i=0;i<100;i++){
最终int ii=i;
试一试{
睡眠(25);
SwingUtilities.invokeLater(新的Runnable(){
@凌驾
公开募捐{
更新BAR(ii);
}
});
}
捕捉(中断异常e){
//TODO自动生成的捕捉块
e、 printStackTrace();
}
}
}
公共void updateBar(int newValue){
dpb.设置值(新值);
}
公共静态void main(字符串[]args){
JBarEx jbx=新JBarEx();
}
}
看看java,因为它们将有助于您的日程安排,并消除对睡眠的需求
看看java,因为它们有助于您的调度,并且消除了睡眠的需要即使您像其他人指出的那样修复了循环,您仍然会阻塞事件调度线程。
for
循环在从事件侦听器调用的showProgress()
中运行。更新被推送到事件队列,但在循环完成之前不会得到处理
用秋千代替。大概是这样的:
Timer timer = new Timer(25, new ActionListener() {
private int position;
@Override
public void actionPerformed(ActionEvent e) {
position++;
if (position < lastPosition) {
updateBar(position);
} else {
((Timer) e.getSource).stop();
}
}
});
timer.start();
即使像其他人指出的那样修复循环,您仍然会阻塞事件分派线程。
for
循环在从事件侦听器调用的showProgress()
中运行。更新被推送到事件队列,但在循环完成之前不会得到处理
用秋千代替。大概是这样的:
Timer timer = new Timer(25, new ActionListener() {
private int position;
@Override
public void actionPerformed(ActionEvent e) {
position++;
if (position < lastPosition) {
updateBar(position);
} else {
((Timer) e.getSource).stop();
}
}
});
timer.start();
您的
showProgress
方法正在事件调度线程的上下文中执行。除其他事项外,EDT负责处理油漆申请。这意味着只要执行for循环
,EDT就无法处理任何新的绘制请求(或处理调用器
事件),因为它正在阻止EDT
虽然有许多可能的方法可以解决这个问题,但根据您的代码示例,最简单的方法是使用
它有能力让您在后台线程中执行长时间运行的任务(释放EDT),还允许您发布更新(如果需要),以便在EDT中处理更新,并提供方便的进度通知
例如
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.SwingWorker;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
public class SwingWorkerProgress {
public static void main(String[] args) {
new SwingWorkerProgress();
}
public SwingWorkerProgress() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JProgressBar pbProgress;
private JButton start;
public TestPane() {
setBorder(new EmptyBorder(10, 10, 10, 10));
pbProgress = new JProgressBar();
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(4, 4, 4, 4);
gbc.gridx = 0;
gbc.gridy = 0;
add(pbProgress, gbc);
start = new JButton("Start");
gbc.gridy++;
add(start, gbc);
start.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
start.setEnabled(false);
ProgressWorker pw = new ProgressWorker();
pw.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
String name = evt.getPropertyName();
if (name.equals("progress")) {
int progress = (int) evt.getNewValue();
pbProgress.setValue(progress);
repaint();
} else if (name.equals("state")) {
SwingWorker.StateValue state = (SwingWorker.StateValue) evt.getNewValue();
switch (state) {
case DONE:
start.setEnabled(true);
break;
}
}
}
});
pw.execute();
}
});
}
}
public class ProgressWorker extends SwingWorker<Object, Object> {
@Override
protected Object doInBackground() throws Exception {
for (int i = 0; i < 100; i++) {
setProgress(i);
try {
Thread.sleep(25);
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
}
}
导入java.awt.BorderLayout;
导入java.awt.EventQueue;
导入java.awt.GridBagConstraints;
导入java.awt.GridBagLayout;
导入java.awt.Insets;
导入java.awt.event.ActionEvent;
导入java.awt.event.ActionListener;
导入java.beans.PropertyChangeEvent;
导入java.beans.PropertyChangeListener;
导入javax.swing.JButton;
导入javax.swing.JFrame;
导入javax.swing.JPanel;
导入javax.swing.JProgressBar;
导入javax.swing.SwingWorker;
导入javax.swing.UIManager;
导入javax.swing.UnsupportedLookAndFeelException;
导入javax.swing.border.EmptyBorder;
公共类SwingWorkerProgress{
公共静态void main(字符串[]args){
新SwingWorkerProgress();
}
公共SwingWorkerProgress(){
invokeLater(新的Runnable(){
@凌驾
公开募捐{
试一试{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}catch(ClassNotFoundException |实例化Exception | IllegalacessException |不支持ookandfeelException ex){
}
JFrame=新JFrame(“测试”);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(新的BorderLayout());
frame.add(newtestpane());
frame.pack();
frame.setLocationRelativeTo(空);
frame.setVisible(true);
}
});
}
公共类TestPane扩展了JPanel{
私人JProgressBar项目进展;
私人按钮启动;
公共测试窗格(){
新订单(新的空订单(10,10,10,10));
pbProgress=新的JProgressBar();
setLayout(新的GridBagLayout());
GridBagConstraints gbc=新的GridBagConstraints();
gbc.插图=新插图(4,4,4,4);
gbc.gridx=0;
gbc.gridy=0;
添加(PBC进度,gbc);
开始=新的JButt
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JBarEx jbx = new JBarEx();
}
});
}
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.SwingWorker;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
public class SwingWorkerProgress {
public static void main(String[] args) {
new SwingWorkerProgress();
}
public SwingWorkerProgress() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JProgressBar pbProgress;
private JButton start;
public TestPane() {
setBorder(new EmptyBorder(10, 10, 10, 10));
pbProgress = new JProgressBar();
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(4, 4, 4, 4);
gbc.gridx = 0;
gbc.gridy = 0;
add(pbProgress, gbc);
start = new JButton("Start");
gbc.gridy++;
add(start, gbc);
start.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
start.setEnabled(false);
ProgressWorker pw = new ProgressWorker();
pw.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
String name = evt.getPropertyName();
if (name.equals("progress")) {
int progress = (int) evt.getNewValue();
pbProgress.setValue(progress);
repaint();
} else if (name.equals("state")) {
SwingWorker.StateValue state = (SwingWorker.StateValue) evt.getNewValue();
switch (state) {
case DONE:
start.setEnabled(true);
break;
}
}
}
});
pw.execute();
}
});
}
}
public class ProgressWorker extends SwingWorker<Object, Object> {
@Override
protected Object doInBackground() throws Exception {
for (int i = 0; i < 100; i++) {
setProgress(i);
try {
Thread.sleep(25);
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
}
}